The photoelectric work function

Options

A. is different for different meterials
B. is same for all metals
C. Depends upon frequency of the incident light
D. Depends upon intensity of the incident light

Answer

### Step-by-Step Solution:

1. **Understanding Work Function**:
The work function (denoted as φ) is defined as the minimum energy required to remove an electron from the surface of a metal. It is a characteristic property of each metal.

2. **Photon Energy Requirement**:
For the photoelectric effect to occur, the energy of the incident photons must be greater than or equal to the work function of the metal. The energy of a photon can be calculated using the equation:
\[ E = h \nu \]
where \( E \) is the energy of the photon, \( h \) is Planck's constant, and \( \nu \) is the frequency of the incident light.

3. **Dependence on Material**:
The work function is not the same for all materials; it varies from one metal to another. For example, the work function for copper is different from that for iron. This means that each metal has its own unique threshold energy required to emit electrons.

4. **Conclusion**:
Since the work function is a property that depends on the type of metal, the answer to the question is that the photoelectric work function is different for different materials.

### Final Answer:
The photoelectric work function is different for different materials.

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